After a brief chat with a few on the IRC, I thought I'd further specify what I'm trying to do:
Let this be the top view of a box (which one day may be the base of a miniature counter). 1----2 | | 3----4 I want to pivot this box around the Y axis but centered using either vertex 1 or 2 such that after a 90 degree rotation (chosen because its easier in ASCII): 3--1 | | 4--2 Note that 2 is at the same position as before the rotation. So, if 2's coordinates was originally (0.5, 0, 0), the line defined by the points: a = soya.Point(self.parent,0.5,0.0,0.0) b = soya.Point(self.parent,0.5,1.0,0.0) should intersect both 2 and the vertex under. However, the line self.rotate(proportion * 5.0, a, b) doesn't rotate the box but instead make it spiral out of view. Interestingly, for: a = soya.Point(self.parent,0.0,0.0,0.0) b = soya.Point(self.parent,0.0,1.0,0.0) works as expected (same as rotate_y). while the almost identical a = soya.Point(self.parent, 0.001, 0.0, 0.0) b = soya.Point(self.parent, 0.0, 1.0, 0.0) Propels the box toward in the -Z direction exptremely fast (which suggest a very, very far away axis of rotation.) I figured that out by multiplying proportion by 0.001 instead of 5.0. I'm assuming that I'm missing something, but this behaviour is confusing to me. Christian _______________________________________________ Soya-user mailing list Soya-user@gna.org https://mail.gna.org/listinfo/soya-user
